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exists(expr, pred) – Tests whether a predicate holds for one or more elements in the

elt(n, input1, input2, …) – Returns the `n`-th input, e.g., returns `input2` when `n` is

encode(str, charset) – Encodes the first argument using the second argument character set. Platforms: WhereOS,

estimated_reach(x) – Estimate reach from a sketch set of Strings. Platforms: WhereOS, Spark, Hive Class:

double(expr) – Casts the value `expr` to the target data type `double`. Platforms: WhereOS, Spark,

each_top_k(int K, Object group, double cmpKey, *) – Returns top-K values (or tail-K values when